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H. SEE.

` STEAM BOILBR.

No. 596,092, Patented Deo. 28,1897.

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UNITED STATES PATENT OFFICE.

HORACE SEE, OF NEW YORK, N. Y.

STI-:AM-BOILER.

SPECIFICATION forming part of Letters Patent No. 596,092, dated December 28, 1897. Appnmon 416,1 August 25,1897. seri41r0-e4a448. (rommel.)

Y boilers to which the boiler set forth in United States Letters Patent No. 580,060, granted to meon April 6, 1897, belongs; anditconsists more particularly in the construction of the drums into which the lower ends of the water-tubes are expanded.

The object of my invention is to simplify the construction of said drums to enable the tube ends to be more conveniently expanded in them and to permit the parts of said drums to be readily assembled.

In the accompanying drawings, Figure l is a longitudinal section of the drum on the line l l of Fig. 3. Fig. 2 is a plan View, and Fig. 3 is a transverse section on the line 3 3 of Fig. l.

Similar letters of reference indicate like parts.

The drum consists of, first, the upper sheet A, which is perforated, as at B, to receive the ends of the tubes, which are expanded in the shouldered openings in the usual way and which may be rounded or externally convex in form; second, the lower sheet O, having one or more inwardly-flanged manholes D to allow of access to the interior of the drum,

and, third, the two inwardly-flanged headsv It will be observed that the edges G of the sheet A are bent over and turned inwardly and are overlapped by the edges H of sheet O, which is in substantially U form, the lapping edges being riveted together, as shown in Fig. 2. The advantage of this construction is that the tube ends can be expanded in the openings B in sheet- A before the sheet O is riveted to sheet A. Hence access to the under side of sheet A during the expanding operation is not in any Wise impeded and the work of securing the tubes in the sheet can be accomplished in a more effective and expeditious manner than if it were done after the drum had been completely constructed.

The object of the manholes D and the openings Fin the tubular heads E, which manholes and openings are to be closed by the usual covers, (not shown,) is to allow of con- Venient access to the interior of the drum during the riveting of the overlapping sheets C and A and also for cleaning and repairs.

I claim- The combination in a boiler-drum of the type herein set forth oi' the curved tube-sheet A ha-ving inwardly and downwardly inclined flanges G, the curved sheet C having its edges -H overlapping the exterior of flanges G, and having an inwardly-flanged or manhole opening D and the tubular heads E within said drum, substantially as described.

HORACE SEE.

Witnesses:

J. F. MELTEN, HARRY A. MosER. 

